Phantom loading-coil.



W. FONDILLER.

PHANTOM LOADlNG COIL.

APPLICATION FILED no.2, 1915.

Patented Nov. 28, 1916.

and nut.

WILLIAM FONDILLER, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PHANTOM LOADING-COIL.

' ductance to physical circuit inductance,

which ratio cannot be made 'sufiiciently high in the various single unit loading schemes which have been proposed. These objects are accomplished by placing windings in a novel manner upon a new type of magnetic structure.

The invention will be more particularly described in connection with the drawings, wherein- Figure 1 is a general view of the new type ofmagnetic structure proposed; Fig. 2 is a circuit diagram showing the method of connecting in the physical circuits; and Fig. 3 is a diagram showing in another way the winding scheme of the structure.

Referring to Fig. 1, 5 and 6 represent two toroidal loading coils located one above the other and separated by the four magnetic yokes or pillars 7. The cores of these coils may be of any suitable magnetic material, and are preferably formed of finely divided iron, the individual particles of which are insulated from one another, the core struc ture being molded by high pressure into the required form, in the manner described and claimed in an application for patent in the name of J. 13. Speed, Serial No. 89,409, filed April 6, 1916, assigned to the same assignee as the present application. The yokes 7 may be made of iron stampings. It is clear that the structure here shown has six possible simple magnetic circuits, and that these are symmetrically arranged, corresponding roughly to the six faces of a cube. Since there are six efiective line conductors in use, two in each pair of physical circuits, and ef= fectively two in the derived circuit, it is clear that these may be disposed upon this structure in a symmetrical way, so that no electromagnetic or electrostatic unbalances Specification of Letters Patent.

Patented Nov. 28, 1916.

Application filed December 2, 1915. Serial No. 64,678.

shall occur. In this invention this is accomplished by so winding the structure that the upper and lower faces shall contain the fluxes used to load the phantom circuit, and

the other faces, in pairs of opposite members, shall contain the magnetic circuits for the physical circuit fluxes. By inspection of the magnetic circuits, it appears that the inductance added to the phantom circuit may be made to have any desired ratio to that added to thephysical circuits.

Fig. 2 shows diagrammatically the connections of the circuits. Here 1 and 2 rep resent the line conductors of one physical circuit, and 3 and l those of the other physical circuit. The phantom circuit is derived from these in the usual manner, namely, by making use of 1 and 2 in parallel as one conductor, and of?) and 4: in parallel as the other conductor. 5 and 6 are the two loading coils which have been described in connection with Fig. 1; these are shown in the same plane for clearness in this drawing, but are actually placed one above the other and connected by means of the yokes' 7, which are here shown in section. Each of the quadrants of these cores is wound with a winding such as 8. One physical circuit conductor 3 passes through the winding 5, and from there through the winding 9 npcn the other loading coil. Similarly, line conductor 1 of the other side circuit passes through winding 10 and also through winding 11 upon the other loading coil. The other physical circuit conductors are similarly connected to other windings. Inspection of this method of winding will show that when line conductors 1 and 2, for example, are used in parallel to form'one conductor of the phantom circuit, and 3 and 4 in parallel to form the other conductor, the fluxes due to currents in these parallel conductors will lie in circular paths in each core. On the other hand, in the normal operation of the side circuits by themselves, currents in the conductors 1 and 2, for example, are in opposite directions, and the fiux linked with either physical circuit will lie in paths which pass along onefourth of the upper loading coil in one direction, down a magnetic yoke, along onefourth of the lower loading coil in'the opposite direction and up a magnetic yoke to the upper loading coil. Flux linked with the same side circuit will also lie in a similar magnetic circuit located diametrically opposite. It will be apparent that by this arrangement the fluxes due to the two physical circuits are independent, as are also those due to either physical circuit and the phantom circuit. Further, since the flux linked with the phantom circuit lies in a path of low magnetic reluctance and the relative reluctance. to the physical circuit flux is adjustable, the inductance added to the phantom circuit may be made to have any desired ratio to that of the physical circuit. Fig. 3 shows, in another form, the method of connection of these cores. In this figure the two loading coils are shown as of difierent diameter, in order to show the mutual relations in a plane drawing. In all of these figures, like numerals refer to corresponding parts.

What is claimed is:

l. The combination of two physical circuits, a derived phantom circuit, two loading coilseach with four windings and means for causing the flux between the two loading coils to link with and load the said physical 1 circuits, the phantom loading being provided by flux lying wholly within said loading coils.

2. The combination of two physical circuits, a derived phantom circuit, two loading coils each with four windings and four magnetic yokes joining said coils and providing paths for the flux used to load the said physical circuits.

3. The combination, with two physical circuits and a phantom circuit, of a loading unit comprising two toroids separated by four symmetrically placed pillars which divide the toroids into quadrants, and a Winding upon each of said quadrants, said windings being so connected that fluxes due to the phantom currents shall lie Wholly in said toroids, and fluxes due to the physical circuit currents lie in paths each containing two quadrants and two pillars.

4. The combination, with two physical circuits and a phantom circuit, of two loading coils having quadrantal windings of which pairs of diagonally opposite windings are connected respectively to the two physical circuits, and four magnetic yokes joining said coils at winding terminals and adapted to carry flux due to the physical circuit currents, while fluxes due to the phantom circuit currents lie in paths wholly in said loading coils.

In witness whereof, I hereunto subscribe my name this th day of November A. D.,

WILLIAM FONDILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of l'atents,

WashingtomD C. 

